Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

300
FXUS63 KLOT 100830
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
330 AM CDT Fri Apr 10 2026

.KEY MESSAGES...

- Rain ends from northwest to southeast this morning.

- Warmer, but more active weather pattern with periods of showers
  and storms returns late in the weekend into next week.

- A threat for severe thunderstorms exists Tuesday and
  Wednesday of next week.

&&

.DISCUSSION...
Issued at 330 AM CDT Fri Apr 10 2026

Rain continues to move across the area from northwest to
southeast early this morning amidst strong low-level warm and
moist advection. So far, rainfall rates have remained largely in
check and should limit the overall flooding impacts other than
localized ponding and minor rises on already elevated creek and
stream levels. There remains a signal for a narrow ribbon of
weak instability moving into areas south of the
Illinois/Kankakee River Valleys which could support a few
embedded lightning strikes early this morning. Hi-res guidance
also hints at the potential for locally gusty winds reaching the
surface from the strong low-level jet overhead in those areas
early this morning, potentially aided by gravity waves that have
developed ahead of the band of showers.

In the wake of this morning`s showers, a cooler day is in store
today compared to yesterday with lingering cloudy skies and
cooler northerly flow holding temperatures in the upper 40s to
mid 50s north of I-80 (cooler near the lakeshore), and upper
50s to around 60 toward central Illinois. Also expect
temperatures to drop steadily in the wake of a lake breeze this
afternoon into the upper 30s and lower 40s by this evening as it
pushes well inland.

Surface high pressure currently over the north central Plains
will translate east toward the western Great Lakes today and
settle over the region overnight. This will bring a temporary
break in the precipitation chances through at least the morning
on Saturday. Warm advective showers and storms that develop
overnight across Iowa will be in a decaying phase as they
approach the area into the afternoon on Saturday. Suspect much
of the area will remain precipitation-free through the afternoon
given the dry low-levels in place amidst the broader surface
high in place. However, a few showers may manage to persist into
the area in the evening, mainly north of I-80. Southeasterly
winds on Saturday will hold high temperatures in the 40s to
lower 50s across far northeast Illinois with upper 50s to lower
60s expected south of I-80 and well inland in northern Illinois.

A broader pattern shift will be well underway heading into next
week with upper troughing becoming established across the
western CONUS. In additional to much warmer (70s/80s
temperatures) and more humid conditions (60s dewpoints) here
locally, this will facilitate the ejection of several mid-level
impulses across the Plains toward the Upper Midwest leading to
several days of convection. We will initially be on the eastern
periphery of this activity, and associated severe weather
potential, which will nudge closer to the area with each
passing day next week.

Sunday will feature strong warm and moist advection into the
region with winds gusting up to 30-35 mph. Temperatures are
currently forecast to warm into the mid-to-upper 70s. However,
if there is thicker cloud cover in place overhead this may be a
few degrees too high. There will also be increasing potential
showers and some embedded thunderstorms late Sunday afternoon
into Sunday night. Given overall weak mid-level lapse rates
forecast, this may serve to limit thunderstorm coverage, and
severe weather is not currently expected with this activity.

At this distance Tuesday and Wednesday still appear to have the
best potential for severe weather here locally (also noted in
SPC long-range outlooks) paired with heavy rainfall. Still a
lot of details to iron out at this distance though. Stay tuned!

Petr

&&

.AVIATION /06Z TAFS THROUGH 12Z SATURDAY/...
Issued at 1247 AM CDT Fri Apr 10 2026

Main Items of Note:

- Rain and associated VSBY reductions early this morning,
  heaviest at RFD where VSBY may get as low as 1SM at times.

- After the heaviest rain moves out, a likely period of IFR CIGs
  will be accompanied by scattered SHRA and reduced VSBY in BR.

- Winds will likely trend to north-northwest this morning and
  then return to northeast this afternoon behind a lake breeze.

Heavier (2-3SM VSBY) rainfall has finally moved into the RFD
area as of this writing, and will take a few more hours to reach
Chicagoland. IFR VSBY in heavier rain rates may only be temporary
for the Chicago metro terminals though. CIGs should deteriorate
during the rain and then in the showery/drizzly/foggy regime
behind it, trend down to prevailing IFR. Given some timing
uncertainty with CIG category trends through the day today,
didn`t make big changes from previous issuances. Confidence is
high in VFR by this evening.

Generally north to northeast winds overnight/early this morning
now appear likely to veer to west of north by or after daybreak.
A lake breeze will shift directions back to northeast as it
pushes inland this afternoon, with wind specifics likely needing
refinement per guidance and observational trends.

Castro

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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